2 files changed, 2 insertions, 3 deletions

diff --git a/apps/gui/viewport.c b/apps/gui/viewport.c
index d91aa42762..d8e5d721e9 100644
--- a/apps/gui/viewport.c
+++ b/apps/gui/viewport.c
@@ -78,7 +78,7 @@ static unsigned viewport_init_ui_vp(void);
 #endif
 static void viewportmanager_redraw(void* data);
 
-int viewport_get_nb_lines(struct viewport *vp)
+int viewport_get_nb_lines(const struct viewport *vp)
 {
 #ifdef HAVE_LCD_BITMAP
     return vp->height/font_get(vp->font)->height;
diff --git a/apps/gui/viewport.h b/apps/gui/viewport.h
index 463de2b333..cedb27e01c 100644
--- a/apps/gui/viewport.h
+++ b/apps/gui/viewport.h
@@ -1,4 +1,3 @@
-
 /***************************************************************************
  *             __________               __   ___.
  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
@@ -30,7 +29,7 @@
 #include "screen_access.h"
 
 /* return the number of text lines in the vp viewport */
-int viewport_get_nb_lines(struct viewport *vp);
+int viewport_get_nb_lines(const struct viewport *vp);
 
 void viewport_set_defaults(struct viewport *vp, enum screen_type screen);